Vibratory motor



Sept. 28, 1954 R. H. J. GENESLAY 2,690,512

VIBRATORY MOTOR 1 Filed Dec. 31, 1951 COIL VIBRATOR BLADE j PERMENANT MAGNET m\\\\ \\\\\\\\m N V EN TOR.

RAYMOND n. J. GIENESLAY Patented Sept. 28, 1954 UNlTED VIBRATORY MOTOR Raymond Henri Joseph Geneslay,

France, assignor to Compagnie Generale de Geophysique (C. G. G.), Paris, France, a corporation of France Application December 31, 1951, Serial No. 264,337

Claims priority, application France January 13, 1951 3 Claims. 1

I have disclosed in my copending specification, Ser. No. 147,123 a circuit breaker for cooperation with vibratory blades and tuning forks, adapted more particularly, for the transformation of direct current into alternating current, for the production of alternating currents at predetermined frequencies, for the rectification of alternating currents and so on. In said copending specifica tion, the contact pieces are constituted by two parts of which one is carried in the usual manner at the end of the vibrating blade while the other, instead of being secured to the stationary frame of the device, is carried by a member adapted to be shifted periodically with reference to said end of the blade in order to provide for the opening and the closing of the current breaker.

This prior arrangement includes a blade-controlled current breaker, comprising at least one contact-piece rigid with the free end of the blade, a cooperating contact piece and means securing the latter to the blade, to make it execute an oscillatory movement with reference to the blade, under the action of the vibration of said blade, the second contact piece may e. g. be carried by an arm pivotally secured to the end of the blade, to rock in a plane passing through the longitudinal axis of the blade under the actual influence of the vibrations of the blade or tuning fork.

This prior arrangement provides the advantage of a very reduced mechanical reaction between the arm or the like member carrying the movable contact piece and the actual operating vibrating blade. In the case of my prior specification, the inobility of the contact piece-carrying member is provided through its being secured pivotally to a spindle secured in its turn to the end of the blade.

Now, experience has shown that the friction of the contact piece-carrying arm or the like member on its pivot leads to some lack of uniformity in operation, which lack of uniformity is particularly objectionable in the case Where the current breaker of the type disclosed serves for instance for the execution of a direct current amplifier in accordance with the wiring diagram disclosed in the French Patent 944,898 filed by the Compagnie Gnrale cle Geophysique on March 29, 1947.

My present invention has for its object an improved embodiment of the movable contact piece in a current breaker of the type disclosed in my said copending specification, which embodiment cuts out in practice any objectionable friction.

According to my invention, the movable member the movement of which opens and closes the current breaker, is constituted by a simple ball made of magnetic steel. Said ball moves inside a tube and the amplitude of its movements is very small with reference to the amplitude of movement of the end of the vibrating blade.

According to a further feature of my invention and in order to provide well defined limits for the movements of the ball without submitting the latter to any mechanical connection, the section of the tube wherein the ball moves shows the following novel features:

Said tube section is provided with a slot the edges of which form a raceway for the ball,

By reason of this slot, the cross section of the tube assumes the shape of a horse shoe magnet and the section is magnetized transversely so as to produce a magnetic field which constrains the ball to roll over the race under the action of magnetic attraction.

My invention will appear more clearly from the reading of the following disclosure referring to accompanying drawings, given by way of a mere exemplification, and wherein:

Fig. 1 is a longitudinal cross-section passing through the axis of the tube and Fig. 2 is a cross-section thereof perpendicular to the axis of the tube taken along the line 22 of Fig. 1.

As apparent from inspection of said figures, l designates a rectilinear tube section inside which may move a ball 2 made of magnetic steel. This tube section is rigidly secured to the outside of a vibratory blade V or to the arm of a tuning fork.

The tube section i is provided with a longitudinal slot 3 (Fig. 2) and it is constituted by an alloy of a magnetic metal so as to form a permanent magnet the magnetization of which is directed transversely with a north pole at N and a south pole at S.

The internal diameter of the tube I is slightly larger than that of the ball 2 which latter is urged by the magnetic field against the inner edges d and 5 of the slot 3, whereby said edges form a kind of raceway for the ball. It is thus apparent that the ball does not require a mechanical connection and moves over a predetermined path with a minimum amount of friction,

The ends of the tube section I are tapped so a to carry the outwardly threaded annular insulated members 6 and I that are also tapped inwardly for engagement by the actual contact pieces 8 and 9 rigid with the vibrating blade V and cooperating in alternation with the ball 2,

3 for the closing of the circuit of the coil controlling the vibrations of the blade.

It is readily apparent that the reciprocating movement of the ball provides for the alternating closing of the circuit through connection between the metal tube I and the contact piece 9 over the ball and between said tube and the contact piece 8 also over the ball.

Furthermore, it is apparent that the oscillations of the ball will provide for the intermittent operation of the coil through any source of energy, such as a battery for constraining the blade to vibrate at a constant amplitude.

Experience shows that the incorporation of the ball operated circuit breaker of the novel type described allows obtaining a very smooth operation of the vibrating blade or tuning fork and that the damping of the vibrating blade provided with such a contact breaker has an exceedingly low value.

It should also be remarked that the magnetic attraction exerted by the magnet on the ball is considerably higher than the energy of gravity, which allows the improved current breaker to operate correctly whatever may be the location and the angular position in space of the vibratory blade to which it is secured.

What I claim is:

1. In combination with a vibratory member, an

electric circuit controlled thereby for maintaining said member vibrating, a current interrupter for said circuit comprising a permanent magnet assuming the shape of a longitudinally slotted rectilinear tube, the poles of said magnet being formed by the cooperating edges of the slot of said tube, said magnet being secured to said vibratory member with its axis lying in the general plane of vibration of the latter, electric contact pieces insulatingly carried at the ends of said tube and connected in parallel in said circuit, a

is slightly less than that of said tube and adapted to roll over the cooperating edges of the slot to reciprocate between said electric contact pieces and to close alternately the circuit between said contact pieces and said tube.

2. The apparatus as set forth in claim 1 further comprising plugs of insulation material supported in the ends of said tube, said contact pieces being threaded into said plugs of insulation material.

3. In combination with a vibratory member, a current interrupter comprising a permanent magnet having the shape of a longitudinally slotted rectilinear tube, the poles of said magnet being formed by the cooperating edges of the slot of said tube, said magnet being secured to said vibratory member with its axis lying in the general plane of vibration of the latter, electric contact pieces insulatingly carried at the ends of said tube, a ball of magnetic material the diameter of which is slightly less of that of said tube positioned in said tube and being adapted to roll over the cooperating edges of the slot to reciprocate between said electric contact pieces and to alternately close the circuit between said contact pieces and said tube as the vibratory member is vibrated.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 767,599 Sedgwick et al Aug. 16, 1904 1,078,106 Miller Nov. 11, 1913 1,692,961 Thompson Nov. 27, 1928 1,905,771 Walker Apr. 25, 1933 1,949,489 Rom Mar. 6, 1934 2,634,377 Parker Apr. 7, 1953 

